drm/i915/guc: Print error name on CTB (de)registration failure

Instead of plain error value (%d) print more user friendly error
name (%pe).
Signed-off-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210926184545.1407-3-michal.wajdeczko@intel.com

drivers/gpu/drm/i915/gt/uc/intel_guc_ct.c

@@ -191,8 +191,8 @@ static int ct_register_buffer(struct intel_guc_ct *ct, u32 type,
 	err = guc_action_register_ct_buffer(ct_to_guc(ct), type,
 					    desc_addr, buff_addr, size);
 	if (unlikely(err))
-		CT_ERROR(ct, "Failed to register %s buffer (err=%d)\n",
-			 guc_ct_buffer_type_to_str(type), err);
+		CT_ERROR(ct, "Failed to register %s buffer (%pe)\n",
+			 guc_ct_buffer_type_to_str(type), ERR_PTR(err));
 	return err;
 }
 
@@ -219,8 +219,8 @@ static int ct_deregister_buffer(struct intel_guc_ct *ct, u32 type)
 	int err = guc_action_deregister_ct_buffer(ct_to_guc(ct), type);
 
 	if (unlikely(err))
-		CT_ERROR(ct, "Failed to deregister %s buffer (err=%d)\n",
-			 guc_ct_buffer_type_to_str(type), err);
+		CT_ERROR(ct, "Failed to deregister %s buffer (%pe)\n",
+			 guc_ct_buffer_type_to_str(type), ERR_PTR(err));
 	return err;
 }